// flex 布局
.fc {
  display: flex;
  justify-content: center;
  align-items: center;
}
.fb {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.fa {
  display: flex;
  justify-content: space-around;
  align-items: center;
}
.fs {
  display: flex;
  justify-content: flex-start;
  align-items: center;
}
.fe {
  display: flex;
  justify-content: flex-end;
  align-items: center;
}
